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“Water?”Here!
Why it’s here: Serves as the solvent base that dissolves or disperses other ingredients, forming the foundation of most creams, lotions, shampoos, and gels.
Plain water, almost always the largest ingredient by weight in a formula and typically purified or deionized before use.
What the evidence says
We haven’t found a source for this one that you can open and check, so we’re not summarizing the evidence.
Look it up yourself — starting points, not our findings: PubChem · PubMed
Context
Present in nearly all rinse-off and leave-on products; its listing high on an ingredient list simply reflects that it makes up most of the product's weight, not a formulation choice worth scrutinizing.